@roland87 avatar
UTC

Molto Verboso
'13 LML Star 200, '81 50 Special, '81 P 150 X, '87 PK 50 Nuova, '84 PK 50 S
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Location: Ukraine. Kyiv.
 
Molto Verboso
@roland87 avatar
'13 LML Star 200, '81 50 Special, '81 P 150 X, '87 PK 50 Nuova, '84 PK 50 S
Joined: UTC
Posts: 1101
Location: Ukraine. Kyiv.
UTC quote
jezza wrote:
About clutch plates as SaFiS said.
But in my opinion you really not need that "carbon" plates.
With DR or Polini 130cc it will be enough 3 plates kit or if you want 4 plates - Newfren or Surflex and Polini spring(in case if you will buy any kit without spring).

RMS primary gear will suit your build.
SaFiS wrote:
Get this. I've used on many builds, does the job for anything not extreme…

https://www.sip-scootershop.com/en/product/clutch-friction-plates-newfren-race_93497500
This kit with Polini Wave spring now work perfect on my Special with VMC 125cc. For sure nothing extreme. But Malossi MHR Sport plates last only for 4500 km.
@roland87 avatar
UTC

Molto Verboso
'13 LML Star 200, '81 50 Special, '81 P 150 X, '87 PK 50 Nuova, '84 PK 50 S
Joined: UTC
Posts: 1101
Location: Ukraine. Kyiv.
 
Molto Verboso
@roland87 avatar
'13 LML Star 200, '81 50 Special, '81 P 150 X, '87 PK 50 Nuova, '84 PK 50 S
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Posts: 1101
Location: Ukraine. Kyiv.
UTC quote
Jezza what clutch type do you have? XL - single spring or XL2 - six springs?
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PK50XL
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Location: Hampshire, UK
 
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PK50XL
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many thanks
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Member
PK50XL
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PK50XL
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UTC quote
Hi Roland 87..... its the standard issue clutch from new for the 1989 Vespa PK50XL, V5X3T.... single spring... I never changed it from new!...
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PK50XL
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PK50XL
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UTC quote
Hi All,

I ended up buying this clutch...

https://www.sip-scootershop.com/en/product/clutch-friction-plates-newfren-race_93497500

The new pack comes with 2 extra plates, whilst they JUST squeeze in, It doesn't feel comfortable.
Does anyone know if these are deliberately in there or simply extras so the pack suits a wider range of models??

Thanks
@roland87 avatar
UTC

Molto Verboso
'13 LML Star 200, '81 50 Special, '81 P 150 X, '87 PK 50 Nuova, '84 PK 50 S
Joined: UTC
Posts: 1101
Location: Ukraine. Kyiv.
 
Molto Verboso
@roland87 avatar
'13 LML Star 200, '81 50 Special, '81 P 150 X, '87 PK 50 Nuova, '84 PK 50 S
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Location: Ukraine. Kyiv.
UTC quote
You need to put in all four plates and discs. Each of it is thiner than in 3-pcs kit.
So overall height of all packed is near the same as 3-pcs.

IMHO - absolutely not needed and not the best clutch kit for you tuning level.
Three plates will hold easily and clutch lever will be noticeable softer.
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PK50XL
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PK50XL
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UTC quote
thanks Roland 87.... bit confused... this was the kit you suggested...

So can remove one of the disks, use 3, and will be softer to use. Correct?
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PK50XL
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PK50XL
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apologies... scratch that, wasnt you.. was Safri
@roland87 avatar
UTC

Molto Verboso
'13 LML Star 200, '81 50 Special, '81 P 150 X, '87 PK 50 Nuova, '84 PK 50 S
Joined: UTC
Posts: 1101
Location: Ukraine. Kyiv.
 
Molto Verboso
@roland87 avatar
'13 LML Star 200, '81 50 Special, '81 P 150 X, '87 PK 50 Nuova, '84 PK 50 S
Joined: UTC
Posts: 1101
Location: Ukraine. Kyiv.
UTC quote
jezza wrote:
thanks Roland 87.... bit confused... this was the kit you suggested...

So can remove one of the disks, use 3, and will be softer to use. Correct?
Sorry mate but you not understood me.
I told about 3 or 4 plates kits here:
roland87 wrote:
About clutch plates as SaFiS said.
But in my opinion you really not need that "carbon" plates.
With DR or Polini 130cc it will be enough 3 plates kit or if you want 4 plates - Newfren or Surflex and Polini spring(in case if you will buy any kit without spring).
And I replied about Newfren "carbon" kit to SaFiS.
jezza wrote:
So can remove one of the disks, use 3, and will be softer to use. Correct?
And no. You MUST put in all four plates and discs.
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PK50XL
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UTC quote
sorry, my mistake... I'm bit worried that this will be a very stiff clutch... which is not comfortable for everyday usage...

Think i will change for one of the other options you suggested.
@roland87 avatar
UTC

Molto Verboso
'13 LML Star 200, '81 50 Special, '81 P 150 X, '87 PK 50 Nuova, '84 PK 50 S
Joined: UTC
Posts: 1101
Location: Ukraine. Kyiv.
 
Molto Verboso
@roland87 avatar
'13 LML Star 200, '81 50 Special, '81 P 150 X, '87 PK 50 Nuova, '84 PK 50 S
Joined: UTC
Posts: 1101
Location: Ukraine. Kyiv.
UTC quote
jezza wrote:
I'm bit worried that this will be a very stiff clutch... which is not comfortable for everyday usage...
It all depends on the personal physical capabilities of everyone. On my Special clutch lever is really stiff. And all who tried it absolutely don't likes it. But for me it is ok. I'm just used to it.

You need to try. Newfren spring is obviously not so stiff as Polini Wave or Malossi.
⬆️    About 1 month elapsed    ⬇️
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PK50XL
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PK50XL
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UTC quote
A little help (again) please…

My rebuild coming along, if taking longer than hoped because of time.. few extra bits to fix along the way.

Changed the clutch to the one suggested by roland87.. fits much better and think will be more comfortable.

I'm just having problems with my Kit.. the one I ordered doesn't fit… I was recommended this one by a friend..

https://catalogue.polini.com/en/product.php?id_prodotto=120&lang=&type=products&marca=&modello=&categoria=&code_word_search=Pk&caller=products

He says

"

It claims to be a 112cc kit and It WOULD BE if you were using a standard crank which is 43mm stroke = 111.66cc

But when you calculate again at 57.50mm piston + 51mm stroke you get.... 132.43!!
"

Is this correct?.. alternatively can someone recommend a 130kit that will fit a small frame 1989 Vespa pk50 xl (v5x3t), with an upgraded crank,..

This should be the easy bit but is proving a pain!!
Thanks for any suggestions!!
@roland87 avatar
UTC

Molto Verboso
'13 LML Star 200, '81 50 Special, '81 P 150 X, '87 PK 50 Nuova, '84 PK 50 S
Joined: UTC
Posts: 1101
Location: Ukraine. Kyiv.
 
Molto Verboso
@roland87 avatar
'13 LML Star 200, '81 50 Special, '81 P 150 X, '87 PK 50 Nuova, '84 PK 50 S
Joined: UTC
Posts: 1101
Location: Ukraine. Kyiv.
UTC quote
I'm bit confused why you ordered 112cc Polini... you can't use it with 51 mm stroke. Theoretically of course yes but absolutely not worth.

About 130cc kit for you build any old and proven will enough:
DR - can be mounted bolt-on without ports matching.
Polini - better to match ports.

Also SIP sell 125cc cylinder under its own brand but it seems like it is VMC GS 125cc just with reworked base so you don't need to cut ignition dust cover as with VMC GS and bit smaller exhaust port. Ports need to be matched. SIP also sell this cylinder in their performance kits so it seems that will ok with your other parts. And if you want more power in future it will give you more with bigger carb and exhaust.

I have VMC GS 125cc on my 50 Special and can say it is very good cylinder for its price. Yes, I have some other performance parts but still. And I think about that SIP cylinder to put it on my PK 50 S it already have SHBC 20L carb and I will stay with it.
⚠️ Last edited by roland87 on UTC; edited 1 time
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PK50XL
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PK50XL
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UTC quote
Thanks roland87… I was confused too, hence my message!!!
Just getting frustrated with the kit… but will review the items you suggested.

Many thanks!!
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